Adiabatic rotating accretion: evolution of the accretion rate (1 Myr average). Top: accretion rate in yr^-1 units, for the rotating (e_rot = 0.3; solid) and nonrotating atmosphere (dot-dashed; see G13). Bottom: accretion rate normalized to the runtime Bondi rate (averaged over r ≈ 1–2 kpc as in large-scale simulations) for the reference rotation e_rot = 0.3 (solid) and e_rot = 0.15 (dotted). The central rotational barrier forming within r_B suppresses accretion by a factor ~3 compared with the spherically symmetric accretion flow.